Which phase of cardiac action potential is caused by closure of the fast sodium channels? phase 0 phase 1 phase 2 phase 3?

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Other than earth, is also known to have magnetic pole reversal? a: venus b: mars c: earths moon d: the sun

How does the diagram explain ocean currents? earth tilt 23.5 degreesquestion 1 options: earth's tilt causes uneven heating of earth which causes currents. earth's tilt causes the ocean to move because of gravity. earth's tilt and its rotation cause currents. earth's tilt causes uneven distribution of salt which causes currents.